JPH11197921A - Cutting edge - Google Patents
Cutting edgeInfo
- Publication number
- JPH11197921A JPH11197921A JP759198A JP759198A JPH11197921A JP H11197921 A JPH11197921 A JP H11197921A JP 759198 A JP759198 A JP 759198A JP 759198 A JP759198 A JP 759198A JP H11197921 A JPH11197921 A JP H11197921A
- Authority
- JP
- Japan
- Prior art keywords
- rake
- cutting
- small
- face
- rake face
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
Landscapes
- Drilling Tools (AREA)
Abstract
Description
【0001】[0001]
【発明の属する技術分野】この発明は、先端にドリル機
能を有するドリルねじや切削工具に採用する切削刃と、
この切削刃が設けられたドリルねじ及び切削工具に関す
る。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a cutting blade used for a drill screw or a cutting tool having a drill function at a tip thereof,
The present invention relates to a drill screw and a cutting tool provided with the cutting blade.
【0002】[0002]
【従来の技術】図5は、先端にドリル機能を有するドリ
ルねじや切削工具の切削刃1の構造を示し、このような
切削刃1において、切削能力を左右する重要な要素に
は、切削速度などの切削条件の他に、刃先2で所定深さ
の被切削物Aの表面をすくい取るすくい面3の「すくい
角a」や、刃先2が加える圧縮力で被切削物Aの組織が
滑りによる破壊を起こしながら、すくい面3を上方向へ
押し曲げられる時の、被切削物Aの表面との角度である
「剪断角b」や、すくい取った跡の被切削物Aの表面と
適当な間隔を有する対向面となる逃げ面4の「逃げ角
c」等の設定があげられる。2. Description of the Related Art FIG. 5 shows a structure of a cutting blade 1 of a drill screw or a cutting tool having a drill function at a tip. In such a cutting blade 1, an important factor that affects a cutting performance is a cutting speed. In addition to the cutting conditions such as the above, the "rake angle a" of the rake face 3 for scooping the surface of the workpiece A having a predetermined depth with the blade edge 2 and the structure of the workpiece A slips due to the compressive force applied by the blade edge 2. When the rake face 3 is pushed upward while being broken by the rake face, the "shear angle b" which is the angle with the surface of the workpiece A or the surface of the workpiece A at the trace of the rake is properly applied. The setting of the “flank angle c” of the flank surface 4 which is the facing surface having an appropriate interval is exemplified.
【0003】一般に、少ない抵抗で被切削物Aを切削し
ようとする場合は、すくい面が垂線との間でつくる「す
くい角a」を大きくし、被切削物Aを圧縮破壊してすく
うのではなく、被切削物Aを引き離すようにしてすくい
取るように、「剪断角b」を大きくするのがよいとされ
ている。Generally, when cutting the workpiece A with a small resistance, it is necessary to increase the "rake angle a" formed between the rake face and the vertical line and to compress and break the workpiece A to scoop. It is said that the "shear angle b" should be increased so that the workpiece A is separated and scooped.
【0004】[0004]
【発明が解決しようとする課題】ところで、切削刃1の
剪断角bを大きく設定すると、すくい面3と逃げ面4の
間で決定される刃先2の角度が小さくなって強度が低下
し、硬質物を切削しようとするときには、刃先2がもた
ないという問題がある。By the way, when the shear angle b of the cutting blade 1 is set to be large, the angle of the cutting edge 2 determined between the rake face 3 and the flank face 4 becomes small, the strength is reduced, and the rigidity is reduced. When trying to cut an object, there is a problem that the cutting edge 2 does not have.
【0005】そこで、この発明の課題は、少ない抵抗で
被切削物を切削することができ、かつ、刃先の強度を確
保することができる切削刃と、この切削刃を用いたドリ
ルねじや切削工具を提供することにある。Accordingly, an object of the present invention is to provide a cutting blade capable of cutting an object to be cut with a small resistance and ensuring the strength of the cutting edge, and a drill screw and a cutting tool using the cutting blade. Is to provide.
【0006】[0006]
【課題を解決するための手段】上記のような課題を解決
するため、請求項1の発明は、刃先のすくい面がすくい
角の異なる複数のすくい面からなる構成を採用したもの
である。Means for Solving the Problems In order to solve the above-mentioned problems, the invention of claim 1 employs a configuration in which the rake face of the cutting edge comprises a plurality of rake faces having different rake angles.
【0007】請求項2の発明は、請求項1の発明におい
て、すくい角の小さいすくい面の幅が、すくい角の大き
いすくい面の幅より小さい構成を採用したものである。A second aspect of the present invention is the invention according to the first aspect, wherein the width of the rake face having a small rake angle is smaller than the width of the rake face having a large rake angle.
【0008】請求項3の発明は、請求項1又は2の発明
において、すくい角の小さいすくい面の後部はすくい角
が大きくなり、隣接するすくい角の大きいすくい面の後
部と同一面となる構成を採用したものである。According to a third aspect of the present invention, in the first or second aspect, the rear portion of the rake face having a small rake angle has a large rake angle and is flush with the rear portion of the adjacent rake face having a large rake angle. Is adopted.
【0009】請求項4の発明は、請求項1乃至3の発明
の何れかに記載の少なくとも一つの切削刃が軸部の先端
に設けられているドリルねじとしたものである。According to a fourth aspect of the present invention, at least one cutting blade according to any one of the first to third aspects of the present invention is a drill screw provided at a tip of a shaft portion.
【0010】請求項5の発明は、請求項1乃至3の発明
の何れかに記載の少なくとも一つの切削刃が軸部の先端
に設けられている切削工具としたものである。According to a fifth aspect of the present invention, there is provided a cutting tool according to any one of the first to third aspects, wherein at least one cutting blade is provided at a tip of a shaft portion.
【0011】[0011]
【発明の実施の形態】以下、この発明の実施の形態を図
示例と共に説明する。Embodiments of the present invention will be described below with reference to the drawings.
【0012】図1(A)乃至(C)は、切削刃を設けた
ドリルねじ11の実施の形態を示し、ドリルねじ11
は、外周にスクリュウ12を形成した軸部13の先端に
切削刃14と後端に頭部15を有している。FIGS. 1A to 1C show an embodiment of a drill screw 11 provided with a cutting blade.
Has a cutting blade 14 at the front end of a shaft portion 13 having a screw 12 formed on the outer periphery and a head portion 15 at a rear end.
【0013】上記切削刃14は、軸部13の先端側に連
ねて設けた円軸部16の先端に円錐部17を設け、この
円錐部17と円軸部16の外面で軸心を挟む両側の位置
に、円錐部17の先端から円軸部16の上端に達する軸
方向の凹部18を形成し、ドリルねじ11のねじこみ回
転方向に対して後方に位置する該凹部18の側縁部分
が、図3に示すように、すくい面19と逃げ面20を有
する刃先21となり、この刃先21のすくい面19をす
くい角の異なる複数のすくい面19aと19bで形成し
た構造になっている。The cutting blade 14 is provided with a conical portion 17 at the tip of a circular shaft portion 16 connected to the distal end side of the shaft portion 13, and on both sides of the conical portion 17 and the outer surface of the circular shaft portion 16 sandwiching the axis. At a position, an axial recess 18 is formed from the tip of the conical portion 17 to the upper end of the circular shaft portion 16, and a side edge portion of the recess 18 located rearward with respect to the screwing rotation direction of the drill screw 11 is As shown in FIG. 3, a cutting edge 21 having a rake face 19 and a flank 20 is provided, and the rake face 19 of the cutting edge 21 is formed of a plurality of rake faces 19a and 19b having different rake angles.
【0014】上記刃先21は、円錐部17と円軸部16
の前記した凹部18の側縁部分の全長にわたり、この刃
先21のすくい面19は、垂線に対してすくい角の小さ
いすくい面19aと、すくい角の大きいすくい面19b
を交互に並べて設けることにより形成され、図4の如
く、すくい角の小さいすくい面19aの幅W1 が、すく
い角の大きいすくい面19bの幅W2 より小さく、か
つ、図3に示すように、すくい角の小さいすくい面19
aの後部はすくい角が大きくなり、隣接するすくい角の
大きいすくい面19bの後部と同一面となっている。The cutting edge 21 includes a conical portion 17 and a circular shaft portion 16.
The rake face 19 of the cutting edge 21 over the entire length of the side edge portion of the recess 18 described above has a rake face 19a having a small rake angle with respect to a perpendicular and a rake face 19b having a large rake angle.
4, the width W1 of the rake face 19a having a small rake angle is smaller than the width W2 of the rake face 19b having a large rake angle, and as shown in FIG. Small rake face 19
The rake angle of the rear part of a is larger, and is flush with the rear part of the adjacent rake face 19b having a large rake angle.
【0015】ここで、上記すくい角の小さいすくい面1
9aの幅W1 を、すくい角の大きいすくい面19bの幅
W2 より小さくすることにより、刃先21の強度を維持
しつつ、切削抵抗の削減を有効に実現することができ
る。Here, the rake face 1 having a small rake angle
By making the width W1 of 9a smaller than the width W2 of the rake face 19b having a large rake angle, it is possible to effectively reduce the cutting resistance while maintaining the strength of the cutting edge 21.
【0016】上記のように、すくい角の小さいすくい面
19aと、すくい角の大きいすくい面19bの隣接する
部分は、図4で示したように、三角形の段部22が生じ
ている。図2(A)、(B)は、切削刃を設けたドリル
である切削工具31の実施の形態を示し、周知のよう
に、ねじれみぞ32を有するドリル本体33の先端切削
刃14(切刃)が、前記ドリルねじの11の実施の形態
の場合と同様、すくい角の小さいすくい面19aと、す
くい角の大きいすくい面19bを交互に並べて設けた構
造になっている。As described above, a triangular step 22 is formed in the portion adjacent to the rake face 19a having a small rake angle and the rake face 19b having a large rake angle as shown in FIG. 2A and 2B show an embodiment of a cutting tool 31 which is a drill provided with a cutting blade. As is well known, a tip cutting blade 14 (a cutting edge) of a drill body 33 having a twist groove 32 is known. ) Has a structure in which rake faces 19a having a small rake angle and rake faces 19b having a large rake angle are alternately provided in the same manner as in the embodiment of the drill screw 11 described above.
【0017】この発明の切削刃は、上記のような構成で
あり、ドリルねじ11の実施の形態では、該ドリルねじ
11をねじ込むとき、先ず切削刃14が被ねじ込み物に
下孔を穿孔し、続いてスクリュウ12で軸部13が下孔
にねじこまれて行く。The cutting blade of the present invention is configured as described above. In the embodiment of the drill screw 11, when the drill screw 11 is screwed in, the cutting blade 14 first drills a prepared hole in the threaded object. Subsequently, the shaft 13 is screwed into the pilot hole by the screw 12.
【0018】また、切削工具31の実施の形態の場合
は、先端切削刃14が被穿孔物を切り込みながら進入
し、ドリル本体33のねじれみぞ32で切削屑を排出
し、被穿孔物に孔を穿設する。Further, in the case of the embodiment of the cutting tool 31, the tip cutting blade 14 enters while cutting the object to be drilled, discharges cutting chips by the twist groove 32 of the drill body 33, and forms a hole in the object to be drilled. Drill.
【0019】上記切削刃14は、ねじ込み時や穿孔時
に、すくい角の大きいすくい面19bの刃先により、少
ない抵抗で切削が可能になり、同時に隣接するすくい角
の小さいすくい面19aの刃先が、刃先全体の強度を確
保することになり、切削刃14全体として、刃先の強度
を保持しつつ、切削性の向上が図れることになる。When the cutting blade 14 is screwed or drilled, the cutting edge of the rake face 19b having a large rake angle enables cutting with a small resistance. At the same time, the cutting edge of the adjacent rake face 19a having a small rake angle has As a result, the strength of the entire cutting blade 14 is secured, and the cutting performance can be improved while maintaining the strength of the cutting edge.
【0020】[0020]
【発明の効果】以上のように、この発明によると、切削
刃の刃先のすくい面をすくい角の異なる複数のすくい面
で形成したので、すくい角の大きいすくい面の刃先によ
り、少ない抵抗で切削が可能になり、同時に隣接するす
くい角の小さいすくい面の刃先が、刃先全体の強度を確
保し、これによって、切削刃全体として、刃先の強度を
保持しつつ、切削性の向上が図れることになる。As described above, according to the present invention, the rake face of the cutting edge is formed by a plurality of rake faces having different rake angles. At the same time, the cutting edge of the adjacent rake face with a small rake angle secures the strength of the entire cutting edge, thereby improving the cutting performance while maintaining the strength of the cutting edge as a whole cutting blade. Become.
【0021】また、すくい角の小さいすくい面の幅を、
すくい角の大きいすくい面の幅より小さくしたので、切
削抵抗の減少が有効に図れると共に、すくい角の小さい
すくい面の後部はすくい角が大きくなり、隣接するすく
い角の大きいすくい面の後部と同一面とすることによ
り、切削屑の排出性が良好となる。The width of the rake face with a small rake angle is
Since the width of the rake face with a large rake angle is smaller than the width of the rake face with a large rake angle, cutting resistance can be effectively reduced, and the rake angle at the rear of the rake face with a small rake angle becomes larger and the same as the rear part of the adjacent rake face with a large rake angle. By using the surface, the discharge property of the cutting waste is improved.
【0022】さらに、この発明の切削刃を設けたドリル
ねじにおいては、軽い力でねじ込みが可能となり、同じ
くこの発明の切削刃を設けたドリルにおいては、軽い力
で穿孔が可能となる。Further, in the drill screw provided with the cutting blade of the present invention, screwing can be performed with a small force, and in the drill provided with the cutting blade of the present invention, drilling can be performed with a small force.
【図1】(A)はドリルねじの正面図、(B)は同上の
刃先部分の拡大正面図、(C)は同上の刃先部分の底面
図1A is a front view of a drill screw, FIG. 1B is an enlarged front view of a cutting edge part of the same, and FIG. 1C is a bottom view of the cutting edge part of the same.
【図2】(A)は切削工具の正面図、(B)は同上の刃
先部分の底面図2A is a front view of a cutting tool, and FIG. 2B is a bottom view of a cutting edge portion of the cutting tool.
【図3】切削刃の断面図FIG. 3 is a sectional view of a cutting blade.
【図4】切削刃の構造を示す説明図FIG. 4 is an explanatory view showing the structure of a cutting blade.
【図5】従来の切削刃の切削状態を示す断面図FIG. 5 is a sectional view showing a cutting state of a conventional cutting blade.
11 ドリルねじ 14 切削刃 19 すくい面 19a すくい角の小さいすくい面 19b すくい角の大きいすくい面 20 逃げ面 21 刃先 31 切削工具 Reference Signs List 11 drill screw 14 cutting blade 19 rake face 19a rake face with small rake angle 19b rake face with large rake angle 20 flank face 21 cutting edge 31 cutting tool
Claims (5)
のすくい面からなることを特徴とする切削刃。1. A cutting blade characterized in that the rake face of the cutting edge comprises a plurality of rake faces having different rake angles.
い角の大きいすくい面の幅より小さいことを特徴とする
請求項1記載の切削刃。2. The cutting blade according to claim 1, wherein the width of the rake face having a small rake angle is smaller than the width of the rake face having a large rake angle.
い角が大きくなり、隣接するすくい角の大きいすくい面
の後部と同一面となることを特徴とする請求項1又は2
記載の切削刃。3. A rake face having a small rake angle has a large rake angle at a rear portion thereof, and the rear portion of the rake face having a large rake angle has the same plane as a rear portion of the rake face having a large rake angle.
The described cutting blade.
とも一つの切削刃が軸部の先端に設けられているドリル
ねじ。4. A drill screw, wherein at least one cutting blade according to claim 1 is provided at a tip of a shaft portion.
とも一つの切削刃が軸部の先端に設けられている切削工
具。5. A cutting tool, wherein at least one cutting blade according to claim 1 is provided at a tip of a shaft portion.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP759198A JPH11197921A (en) | 1998-01-19 | 1998-01-19 | Cutting edge |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP759198A JPH11197921A (en) | 1998-01-19 | 1998-01-19 | Cutting edge |
Publications (1)
Publication Number | Publication Date |
---|---|
JPH11197921A true JPH11197921A (en) | 1999-07-27 |
Family
ID=11670061
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP759198A Pending JPH11197921A (en) | 1998-01-19 | 1998-01-19 | Cutting edge |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPH11197921A (en) |
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2014030882A (en) * | 2012-08-06 | 2014-02-20 | Aisin Aw Co Ltd | Cutting tool |
JP2015200346A (en) * | 2014-04-07 | 2015-11-12 | 北村精工株式会社 | drill screw |
US10974327B1 (en) * | 2019-10-31 | 2021-04-13 | Facet Precision Tool GmbH | Drills and drill bits with buttressed chip breakers |
-
1998
- 1998-01-19 JP JP759198A patent/JPH11197921A/en active Pending
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2014030882A (en) * | 2012-08-06 | 2014-02-20 | Aisin Aw Co Ltd | Cutting tool |
JP2015200346A (en) * | 2014-04-07 | 2015-11-12 | 北村精工株式会社 | drill screw |
US10974327B1 (en) * | 2019-10-31 | 2021-04-13 | Facet Precision Tool GmbH | Drills and drill bits with buttressed chip breakers |
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